DNS flag day

If you are a sys admin you will want to know about big guns (Google, Cloudflare, Cisco, Facebook and others) shutting down support for bad (or lack of) implementation of EDNS(0) extension on 1st February 2019, potentially leaving some domains cut off from the Internet.

There are easy ways to check if your domains will be affected by testing your zone's authoritative name servers.

Re: DNS flag day

Yes, that is one big part of the picture. Network guys will be busy beavers until they figure out the way to learn how to properly set up the service, if the cause for particular DNS server to act iffy turns out to be misconfigured router/firewall.

Re: DNS flag day

Thanks for the reply,Ever since reading this thread I have been trying to figure out whether people are saying it will affect the routers that are serving DNS and webservers only, or do I need to configure the firewalls and routers on my home network too? I have to admit some of the language surrounding EDNS is confusing to me and I have information overload at the moment so am not seeing it perhaps.

Well when I write my book, and tell the tale of my adventures--all these little stars that shake out of my cloak-- I must save those to use for asterisks!”Edmond Rostand, Cyrano de Bergerac

Re: DNS flag day

If your home Internet connection is working properly and you haven't noticed any trouble opening websites (symptoms like slow loading of pages, unable to resolve certain domains), then no action is required at your side.

About EDNS, I agree that it's kind of confusing. For me the confusing part is the fact that nobody was seriously developing forward the technology that is underlying the whole Internet (DNS), and current EDNS solution looks to me like Frankenstein in IT world.